I have several users, 3 out of 8, that are unable to accept updates to an existing, recurring Outlook 2007 meeting. The "respond" portion of the ribbon bar with the Accept, Tentative, Decline buttons is not visible at all. The "other" 5 users who are part of the meeting invite are able to accept the update without any issues utilizing the Accept button. Users who do not get the Accept/Decline buttons do not report any other issues with Outlook.
All attendees are domain members and use company (domain) email address.
No external invitiees.
Exchange 2003 w/current SP and udpates.
Outlook 2007, SP3.
No internet calendars involved.
Organizer, invitees and Exchange have all rebooted.
Some users have had OST renamed to force new OST creation.
Have not tried recreating local Outlook profiles...yet.
Looking for some direction and troubleshooting options.